Spark-plug



G. W. NOE.

\ SPARK PLUG. APPLICATION FILED OCT. 20. 1919.

L.1",356, 782.j I Patented 0et.26, 192 0.

Gm" Q13 (J11 00 u m jao . outwardly into the recess 16 a distance,

GEORGE W. NOE, OF CLINTON, 'MISSO' URI.

SYARK-ZJPLUG.

Specification of Letters Patent.

Application and October 20, 1919. seiiarno. 331,214.

1 0 all whommay 0011 ccrn j Be it known that l, (iuonuu Non, a citizen of the l nitcd States, residing at Clinton, in the county of I'lcnry and State of Missouri, have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification.

The invention has for an object to effect improvements in spark plugs whereby the efficiency of such devices will be increased, especially by reducing the liability to fouling by carbon accumulations. A further aim is to effect an improvement in the specific construction whereby accumulation of carbon on the porcelain is prevented; and another aim is to give a cage construction of an improved form upon the shell or casing. A still further aim is to'effect in'iprovements in spark plugs whereby the efiiciency of such devices will be increased. especially by re ducing the liability of fouling by oil accumulations.

Additional objects, advantages and features of invention will appear from the 0on struction, arrangementand combination of parts hereinafter described and shown in the drawings,wherein, Figure 1 is an elevational view of a plug constructed in accordance with my invention.

Fig. Fig. in the .2 is'a vertical sectional view thereof, 3 is a detail of one of the openings cage portion of the shell,

Fig. 4 is a detail of the shell.

Fig. 5 is a longitudinal sectional view of a further preferred embodiment of the invention.

There is illustrated a plug comprising a casing 10 threaded at 11 in the usual manner for engagement in the tapped plug opening of an internal combustion motor cylinder, the upper part being hexagonalto permit its manipulation by a wrench, and suitably enlarged to receive a shouldered porcelain as will be described. The interior of the lower portion is cylindrical in form terminating at the inner end in a shoulder 12, and upon the end portion of the plug there. is formed a cage 13, comprising a semispheric'al wall having a plurality of apertures 14 therein and one large central aperture 15. The apertures 14 consist of outer recessed portions 16 of large diameter with a reduced inner bore 17 terminating ina small cone 18 at the outer end, extendibng stopping short of the projected periphery- Patented Oct. 265 1920.

of the cage 13, Engaged in the casing there is a porcelain 19 having an inner end portion snugly fitted in the cylindrical inner part of the casing 10 abutting against a gasket 20 set upon the shoulder 12, the porcelain having a large shoulder 21 against which there may engagea gland 22 screwed lIltO the outer part of the casin g, which is suitably threaded upon the interior for the purpose. wise suitably secured positively in the porcelain, and the inner end of the porcelain is planiform and extends snugly against the electrode, which is projected beyond this planiform surface of the porcelain .very slightly, in practice in the neighborhood of Terminal connections 25 are provided at the outer end of the electrode. The cage An electrode 23 is cast or otheror less than one-sixty-fourth of an inch.

His formed so as to be concentric with the inner end of the electrode, and disposed loosely within the cagethcre is a ball 26 which serves as a ground electrode, being of a size to form a gap between itself and the electrode 23 suitable forthe jump spark oil'dinarily used in systems employing such ugs. It-will be seen that throughout any movement of the ball 26, it can never be at at greater distance from the-electrode than will give a proper gap ordinary systems, but by the action of gases injected through the apertures 14 it may at times be blown into contact with the electrode or with the surfaces of the porcelain thereadjacent, and by its,mbvement keep the porcelainsurface clear of carbon for a distance sufficient to prevent a short circuit. The bores 17 are on an axis intersecting the lower face of the porcelain near its outer part, so that jets of incandescent gas are projected against the porcelain, tending to knock or brush off any carbon which may accumulate. The entering through the bores 17 also serves to agitate the balls in the for the spark to jump in cage causing removal of carbon by abrasion. i

In Fig. 5, there is shown a larger porcelain 19, the construction of the porcelain the same as before described. The elec- .105 I and its manner of mounting being otherwise trode, however, terminates flush with the end'face of the porcelain. Within the cage 13 ,'however, there are inclosed a pluralityof balls, one large one 27 forming the medium through which the high tension from the electrode than can be reached by the larger ball. Thesesn'ialler balls are preferably of such size and number that liability of the larger ball to be raised thereon so as :to short circuit the plug is obviated.

It may be found desirable to reduce or in crease the number beyond that shown in the drawing.

What is claimed:

A plug of the character described comprising a casing having aterminal cage comprising a semi-spherical wall having a plurality of recesses in its outer side and respective central apertures through the wall, said apertures having cone-shaped terminal portions therearound Within said recesses stopping short of a projection of the outer surface of the cage, a porcelain mounted in the plug and having lts inner face cxposed Within the cage, an electrode in the porcelain slightly projected therefrom concentrically of the cage, and a ball 'member loosely disposed within the cage of a size to form a spark gap between the electrode and the ball.

In testimony whereof I have affixed my signature in presence of two witnesses.

' GEORGE W. Non. Witnesses Dnxxis Sums, E. F. ALLEN. 

